Get the combo ready. Before making this play, ensure you have a light monster and a dark monster in your graveyard, Chaos Emperor Dragon in your hand, one Sangan or Witch of the Black Forest on the field, more than 1000 Life Points, and a normal summon available.

3

If you can, destroy your opponent's set cards with Harpie's Feather Duster, Heavy Storm, or Giant Trunade. This helps ensure the safety of your combo.

4

Summon Chaos Emperor Dragon. Banish your light monster and dark monster from the graveyard to special summon Chaos Emperor Dragon from your hand. This is the only way it can be summoned.

5

Activate its effect. By paying 1000 LP, you can destroy all cards on the field and in both player's hands (This includes Chaos Emperor Dragon itself), then inflict 300 damage to your opponent for each card sent to the Graveyard this way.

6

Activate Sangan or Witch's effect. Because it was sent to the Graveyard by Chaos Emperor Dragon, you can add Yata-Garasu from your deck to your hand.

7

Summon Yata-Garasu and attack directly. If you inflict damage, Yata-Garasu will prevent the opponent from drawing next turn. They will end up with no cards in the hand or field and no way to get more, and so be unable to win.

8

Continue your direct attacks until they run out of Life points or surrender. Be careful, as you can still lose if you run out of cards to draw.

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Tips

This works well when using a Chaos Deck.

With Chaos Emperor Dragon's new errata, this lock is no longer possible, since no other effects can be activated in the same turn as Chaos Emperor Dragon's effect. You can still perform it if you draw Yata-Garasu next turn, but it is gimmicky and allows your opponent an opportunity to topdeck something to save them.

If you don't want to use banned Spell/Trap destruction cards, you can use Twin Twister or Trap Stun.

Warnings

Do NOT try this in a tournament as both Yata-Garasu and Chaos Emperor Dragon are banned in the Advanced Format. This deck can only be used in Traditional Format.

Clear your opponent's Spell and Traps with Heavy Storm or another card in case they can stop your combo!